I want to increase the DTMF duration on MC series modem using at command AT+VTD= on WCDMA/3G network. Command executes fine but does not have any effect. The DTMF duration sent from module remain the same. Questions:
- How to increase DTMF duration using SDK/AT command?
- How to find what is the current DTMF duration and time between two DTMF tones?